package com.atguigu.gmall.product.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.atguigu.gmall.common.cache.GmallCache;
import com.atguigu.gmall.common.config.constant.MqConst;
import com.atguigu.gmall.common.config.service.RabbitService;
import com.atguigu.gmall.common.constant.RedisConst;
import com.atguigu.gmall.model.product.*;
import com.atguigu.gmall.product.mapper.*;
import com.atguigu.gmall.product.service.ManageService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @author atguigu-mqx
 */
@Service
public class ManageServiceImpl implements ManageService {

    //  调用mapper 层！
    @Autowired
    private BaseCategory1Mapper baseCategory1Mapper;

    @Autowired
    private BaseCategory2Mapper baseCategory2Mapper;

    @Autowired
    private BaseCategory3Mapper baseCategory3Mapper;

    @Autowired
    private BaseAttrInfoMapper baseAttrInfoMapper;

    @Autowired
    private BaseAttrValueMapper baseAttrValueMapper;

    @Autowired
    private SpuInfoMapper spuInfoMapper;

    @Autowired
    private BaseSaleAttrMapper baseSaleAttrMapper;

    @Autowired
    private SpuImageMapper spuImageMapper;

    @Autowired
    private SpuSaleAttrMapper spuSaleAttrMapper;

    @Autowired
    private SpuSaleAttrValueMapper spuSaleAttrValueMapper;

    @Autowired
    private SpuPosterMapper spuPosterMapper;

    @Autowired
    private SkuInfoMapper skuInfoMapper;

    @Autowired
    private SkuImageMapper skuImageMapper;

    @Autowired
    private SkuSaleAttrValueMapper skuSaleAttrValueMapper;

    @Autowired
    private SkuAttrValueMapper skuAttrValueMapper;

    @Autowired
    private BaseCategoryViewMapper baseCategoryViewMapper;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RedissonClient redissonClient;

    @Autowired
    private BaseTrademarkMapper baseTrademarkMapper;

    @Autowired
    private RabbitService rabbitService;



    @Override
    public List<BaseCategory1> getCategory1() {
        //  select * from base_category1
        return baseCategory1Mapper.selectList(null);
    }

    @Override
    public List<BaseCategory2> getCategory2(Long category1Id) {
        //  select * from base_category2 where category1_id = category1Id
        QueryWrapper<BaseCategory2> baseCategory2QueryWrapper = new QueryWrapper<>();
        baseCategory2QueryWrapper.eq("category1_id",category1Id);
        return baseCategory2Mapper.selectList(baseCategory2QueryWrapper);
    }

    @Override
    public List<BaseCategory3> getCategory3(Long category2Id) {
        //  select * from base_category3 where category2_id = category2Id
        return baseCategory3Mapper.selectList(new QueryWrapper<BaseCategory3>().eq("category2_id",category2Id));
    }

    //  根据分类Id 查询数据：平台属性
    @Override
    public List<BaseAttrInfo> getAttrInfoList(Long category1Id, Long category2Id, Long category3Id) {
        //  根据分析可能需要具备的知识点：mybatis的动态sql 标签！
        //  多表关联查询：因此 使用*Mapper.xml
        //  开发的默认规则： service 层 ；get  save mapper层；select insert
        return baseAttrInfoMapper.selectAttrInfoList(category1Id, category2Id, category3Id);

    }

    @Override
    @Transactional(rollbackFor = Exception.class) // 有异常就回滚！
    public void saveAttrInfo(BaseAttrInfo baseAttrInfo) {
        //  这个控制器 ，有添加功能，也有修改功能！ base_attr_info
        if (baseAttrInfo.getId()==null){
            //  插入数据：
            baseAttrInfoMapper.insert(baseAttrInfo);
        }else {
            //  修改数据
            baseAttrInfoMapper.updateById(baseAttrInfo);
        }
        //  base_attr_value 先删除，再新增！
        //  delete from base_attr_value where attr_id = ?;
        QueryWrapper<BaseAttrValue> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("attr_id",baseAttrInfo.getId());
        baseAttrValueMapper.delete(queryWrapper);

        //  获取平台属性值集合数据
        List<BaseAttrValue> attrValueList = baseAttrInfo.getAttrValueList();
        //  普通循环
        for (BaseAttrValue baseAttrValue : attrValueList) {
            //  attrId 传递的时候是null
            baseAttrValue.setAttrId(baseAttrInfo.getId());
            baseAttrValueMapper.insert(baseAttrValue);
        }
    }

    @Override
    public List<BaseAttrValue> getAttrValueList(Long attrId) {
        //  直接返回数据
        return baseAttrValueMapper.selectList(new QueryWrapper<BaseAttrValue>().eq("attr_id",attrId));
    }

    @Override
    public BaseAttrInfo getBaseAttrInfo(Long attrId) {
        //  select * from base_attr_info where id = attrId;
        BaseAttrInfo baseAttrInfo = baseAttrInfoMapper.selectById(attrId);
        //  给attrValueList 赋值！
        if (baseAttrInfo!=null){
            baseAttrInfo.setAttrValueList(getAttrValueList(attrId));
        }
        //  返回数据！
        return baseAttrInfo;
    }

    @Override
    public IPage getSpuInfoPage(Page iPage, SpuInfo spuInfo) {
        //  select * from spu_info where category3_id = 61 order by id desc limit 0 , 10;
        QueryWrapper<SpuInfo> spuInfoQueryWrapper = new QueryWrapper<>();
        spuInfoQueryWrapper.eq("category3_id",spuInfo.getCategory3Id());
        spuInfoQueryWrapper.orderByDesc("id");
        return spuInfoMapper.selectPage(iPage,spuInfoQueryWrapper);
    }

    @Override
    public List<BaseSaleAttr> getBaseSaleAttrList() {
        //  select * from base_sale_attr;
        return baseSaleAttrMapper.selectList(null);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void saveSpuInfo(SpuInfo spuInfo) {
        /*
        spuInfo;	商品表
        spuImage;	商品图片表
        spuSaleAttr;	销售属性
        spuSaleAttrValue;	销售属性值
        spuPoster;	商品海报
         */
        spuInfoMapper.insert(spuInfo);
        //  商品图片表
        List<SpuImage> spuImageList = spuInfo.getSpuImageList();
        //  判断
        if (!CollectionUtils.isEmpty(spuImageList)){
            //  循环遍历
            spuImageList.stream().forEach((spuImage -> {
                //  你是怎么知道spuId 为 null
                spuImage.setSpuId(spuInfo.getId());
                spuImageMapper.insert(spuImage);
            }));
        }

        //  销售属性
        List<SpuSaleAttr> spuSaleAttrList = spuInfo.getSpuSaleAttrList();
        //  判断
        if (!CollectionUtils.isEmpty(spuSaleAttrList)){
            spuSaleAttrList.stream().forEach((spuSaleAttr -> {
                spuSaleAttr.setSpuId(spuInfo.getId());
                spuSaleAttrMapper.insert(spuSaleAttr);

                //  获取销售属性值集合
                List<SpuSaleAttrValue> spuSaleAttrValueList = spuSaleAttr.getSpuSaleAttrValueList();
                if (!CollectionUtils.isEmpty(spuSaleAttrValueList)) {
                    spuSaleAttrValueList.stream().forEach(spuSaleAttrValue -> {
                        //  赋值
                        spuSaleAttrValue.setSpuId(spuInfo.getId());
                        spuSaleAttrValue.setSaleAttrName(spuSaleAttr.getSaleAttrName());
                        spuSaleAttrValueMapper.insert(spuSaleAttrValue);
                    });
                }
            }));
        }

        //  spuPoster 海报
        List<SpuPoster> spuPosterList = spuInfo.getSpuPosterList();
        if (!CollectionUtils.isEmpty(spuPosterList)) {
            spuPosterList.stream().forEach(spuPoster -> {
                spuPoster.setSpuId(spuInfo.getId());
                spuPosterMapper.insert(spuPoster);
            });
        }

    }

    @Override
    public List<SpuImage> getSpuImageList(Long spuId) {
        return spuImageMapper.selectList(new QueryWrapper<SpuImage>().eq("spu_id",spuId));
    }

    @Override
    public List<SpuSaleAttr> getSpuSaleAttrList(Long spuId) {
        //  调用mapper ，多表关联！
        return spuSaleAttrMapper.selectSpuSaleAttrList(spuId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void saveSkuInfo(SkuInfo skuInfo) {
        /*
            将数据插入数据库表！
            skuInfo:	库存单元表！	记录是哪个spu下的sku!
            skuImage:	库存单元图片表!
            skuSaleAttrValue;	sku 与 销售属性值中间表！
            skuAttrValue:	sku 与平台属性值中间表！
         */
        skuInfoMapper.insert(skuInfo);

        //  获取skuImage 集合
        List<SkuImage> skuImageList = skuInfo.getSkuImageList();
        //  判断
        if (!CollectionUtils.isEmpty(skuImageList)) {
            skuImageList.stream().forEach(skuImage -> {
                skuImage.setSkuId(skuInfo.getId());
                skuImageMapper.insert(skuImage);
            });
        }
        //  skuAttrValue
        if (!CollectionUtils.isEmpty(skuInfo.getSkuAttrValueList())) {
            skuInfo.getSkuAttrValueList().stream().forEach(skuAttrValue -> {
                skuAttrValue.setSkuId(skuInfo.getId());
                //  应该能够获取到平台属性名，平台属性值名！
                //  应该页面自动获取！   查询：category3Id 查询到平台属性名！但是绝对找不到要给的属性值名称！
                //  经过分析：可以不用赋值attrName valueName;
                skuAttrValueMapper.insert(skuAttrValue);
            });
        }
        //  skuSaleAttrValue
        if (!CollectionUtils.isEmpty(skuInfo.getSkuSaleAttrValueList())) {
            skuInfo.getSkuSaleAttrValueList().stream().forEach(skuSaleAttrValue -> {
                //  spuId，skuId
                skuSaleAttrValue.setSpuId(skuInfo.getSpuId());
                skuSaleAttrValue.setSkuId(skuInfo.getId());
                skuSaleAttrValueMapper.insert(skuSaleAttrValue);
            });
        }
    }

    @Override
    public IPage getList(Page<SkuInfo> skuInfoPage) {
        QueryWrapper<SkuInfo> skuInfoQueryWrapper = new QueryWrapper<>();
        skuInfoQueryWrapper.orderByDesc("id");
        return skuInfoMapper.selectPage(skuInfoPage,skuInfoQueryWrapper);
    }

    @Override
    public void onSale(Long skuId) {
        //  update sku_info set is_sale = 1 where id = skuId;
        SkuInfo skuInfo = new SkuInfo();
        skuInfo.setId(skuId);
        skuInfo.setIsSale(1);
        skuInfoMapper.updateById(skuInfo);

        //  在此，需要发送一个消息！
        //  发送的消息是什么?  需要根据监听消息的业务逻辑判断！
        this.rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_GOODS,MqConst.ROUTING_GOODS_UPPER,skuId);
    }

    @Override
    public void cancelSale(Long skuId) {
        //  update sku_info set is_sale = 0 where id = skuId;
        SkuInfo skuInfo = new SkuInfo();
        skuInfo.setId(skuId);
        skuInfo.setIsSale(0);
        skuInfoMapper.updateById(skuInfo);
        //  发送 消息，商品下架！
        this.rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_GOODS,MqConst.ROUTING_GOODS_LOWER,skuId);
    }

    @Override
    @GmallCache(prefix = "sku:")
    public SkuInfo getSkuInfo(Long skuId) {
        //  return getSkuInfoRedisson(skuId);
        return getSkuInfoDB(skuId);
    }

    private SkuInfo getSkuInfoRedisson(Long skuId) {
        //  判断缓存中是否有数据！ 直接从缓存获取，能够获取到就说明有数据，否则就没有数据！
        try {
            //  定义缓存的key sku:skuId:info
            String skuKey = RedisConst.SKUKEY_PREFIX+skuId+RedisConst.SKUKEY_SUFFIX;
            SkuInfo skuInfo = (SkuInfo) redisTemplate.opsForValue().get(skuKey);
            //  判断
            if(skuInfo==null){
                //  走数据库+加锁！
                String lockKey = RedisConst.SKUKEY_PREFIX+skuId+RedisConst.SKULOCK_SUFFIX;
                RLock lock = redissonClient.getLock(lockKey);
                //  加上锁
                boolean result = lock.tryLock(RedisConst.SKULOCK_EXPIRE_PX1, RedisConst.SKULOCK_EXPIRE_PX2, TimeUnit.SECONDS);
                if (result){
                    try {
                        // 业务逻辑！
                        //  执行业务逻辑！
                        skuInfo = getSkuInfoDB(skuId);
                        //  防止缓存穿透！
                        if(skuInfo==null){
                            SkuInfo skuInfo1 = new SkuInfo();
                            this.redisTemplate.opsForValue().set(skuKey,skuInfo1,RedisConst.SKUKEY_TEMPORARY_TIMEOUT,TimeUnit.SECONDS);
                            return skuInfo1;
                        }
                        //  数据库中有数据！
                        this.redisTemplate.opsForValue().set(skuKey,skuInfo,RedisConst.SKUKEY_TIMEOUT,TimeUnit.SECONDS);

                        return skuInfo;
                    } finally {
                        lock.unlock();
                    }
                }else {
                    //  没有获取到锁的人！
                    try {
                        Thread.sleep(100);
                        return getSkuInfo(skuId);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }else {
                //  缓存中有数据直接返回
                return skuInfo;
            }
        } catch (InterruptedException e) {
            //  记录日志.....
            e.printStackTrace();
        }
        //  return getSkuInfoByRedisLua(skuId);
        return getSkuInfoDB(skuId);
    }

    private SkuInfo getSkuInfoByRedisLua(Long skuId) {
        //  定义缓存的key sku:skuId:info
        String skuKey = RedisConst.SKUKEY_PREFIX+skuId+RedisConst.SKUKEY_SUFFIX;
        try {
            SkuInfo skuInfo = (SkuInfo) redisTemplate.opsForValue().get(skuKey);
            //  判断
            if(skuInfo==null){
                //  说明缓存中没有数据！查询数据库，并添加分布式锁的业务逻辑
                //  redis + lua
                String uuid = UUID.randomUUID().toString();
                //  加锁
                //  定义一个锁的key sku:skuId:lock
                String lockKey = RedisConst.SKUKEY_PREFIX+skuId+RedisConst.SKULOCK_SUFFIX;
                Boolean flag = this.redisTemplate.opsForValue().setIfAbsent(lockKey, uuid,RedisConst.SKULOCK_EXPIRE_PX1, TimeUnit.SECONDS);
                //  flag = true 表示获取到了锁
                if (flag){
                    //  执行业务逻辑！
                    skuInfo = getSkuInfoDB(skuId);
                    //  防止缓存穿透！
                    if(skuInfo==null){
                        SkuInfo skuInfo1 = new SkuInfo();
//                        this.redisTemplate.opsForValue().set(skuKey,null,RedisConst.SKUKEY_TEMPORARY_TIMEOUT,TimeUnit.SECONDS);
//                        return skuInfo;
                        this.redisTemplate.opsForValue().set(skuKey,skuInfo1,RedisConst.SKUKEY_TEMPORARY_TIMEOUT,TimeUnit.SECONDS);
                        return skuInfo1;
                    }
                    //  数据库中有数据！
                    this.redisTemplate.opsForValue().set(skuKey,skuInfo,RedisConst.SKUKEY_TIMEOUT,TimeUnit.SECONDS);

                    //  删除锁对象
                    //  准备一个lua 脚本！
                    String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";

                    DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
                    //  存储lua 脚本
                    redisScript.setScriptText(script);
                    redisScript.setResultType(Long.class);
                    this.redisTemplate.execute(redisScript, Arrays.asList(lockKey),uuid);
                    return skuInfo;
                }else {
                    //  没有获取到锁的人！
                    try {
                        Thread.sleep(1000);
                        //  自旋
                        return getSkuInfo(skuId);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }else {
                //  缓存不为空！
                return skuInfo;
            }
        } catch (Exception e) {
            //  记录日志信息....
            e.printStackTrace();
        }
        //  表示获取数据库中的数据！
        return getSkuInfoDB(skuId);
    }

    /**
     * 从数据库中获取数据
     * @param skuId
     * @return
     */
    private SkuInfo getSkuInfoDB(Long skuId) {
        //  获取skuInfo
        SkuInfo skuInfo = skuInfoMapper.selectById(skuId);

        //  判断skuInfo 是否为空！
        if (skuInfo !=null){
            //  需要skuImageList
            List<SkuImage> skuImageList = skuImageMapper.selectList(new QueryWrapper<SkuImage>().eq("sku_id", skuId));

            skuInfo.setSkuImageList(skuImageList);
        }

        return skuInfo;
    }

    //  获取最新的价格！
    @Override
    public BigDecimal getPrice(Long skuId) {
        //  select price from sku_info where id = skuId;
        //  select * from sku_info where id = skuId;
        //  SkuInfo skuInfo = skuInfoMapper.selectById(skuId);
        //  不需要将数据放入缓存！
        RLock lock = redissonClient.getLock(skuId + ":lock");
        //  上锁
        lock.lock();
        SkuInfo skuInfo = null;
        BigDecimal price = new BigDecimal(0);
        try {
            QueryWrapper<SkuInfo> skuInfoQueryWrapper = new QueryWrapper<>();
            skuInfoQueryWrapper.eq("id",skuId);
            skuInfoQueryWrapper.select("price");
            skuInfo = skuInfoMapper.selectOne(skuInfoQueryWrapper);
            if (skuInfo!=null){
                price = skuInfo.getPrice();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //  解锁！
            lock.unlock();
        }
        //  返回价格
        return price;
    }

    @Override
    @GmallCache(prefix = "CategoryView:")
    public BaseCategoryView getCategoryName(Long category3Id) {
        //  category3Id 从哪里的?
        BaseCategoryView baseCategoryView = baseCategoryViewMapper.selectById(category3Id);
        return baseCategoryView;
    }

    @Override
    @GmallCache(prefix = "SpuSaleAttrListById:")
    public List<SpuSaleAttr> getSpuSaleAttrListById(Long skuId, Long spuId) {
        //  返回数据
        return spuSaleAttrMapper.selectSpuSaleAttrListById(skuId,spuId);
    }

    @Override
    @GmallCache(prefix = "ValueIdsAndSkuIdToMap:")
    public Map getValueIdsAndSkuIdToMap(Long spuId) {
        //  声明map 集合
        HashMap<Object, Object> hashMap = new HashMap<>();
        //  获取销售属性值Id 与skuId ！
        //  执行sql 语句获取到
        List<Map> mapList = skuSaleAttrValueMapper.selectValueIdsAndSkuIdToMap(spuId);
        //  map.put(key,value)
        // select * from base_category1; List<BaseCategory1>  base.setName(name);
        if (!CollectionUtils.isEmpty(mapList)){
            mapList.stream().forEach((map->{
                hashMap.put(map.get("value_ids"),map.get("sku_id"));
            }));
        }
        //  返回数据
        return hashMap;
    }

    @Override
    @GmallCache(prefix = "SpuPosterList:")
    public List<SpuPoster> getSpuPosterList(Long spuId) {
        //  select * from spu_poster where spu_id = spuId;
        return spuPosterMapper.selectList(new QueryWrapper<SpuPoster>().eq("spu_id",spuId));
    }

    @Override
    @GmallCache(prefix = "BaseAttrInfoList:")
    public List<BaseAttrInfo> getBaseAttrInfoList(Long skuId) {
        //  根据skuId 获取数据
        return baseAttrInfoMapper.selectBaseAttrInfoList(skuId);
    }

    @Override
    public List<JSONObject> getBaseCategoryList() {
        //  声明一个集合
        List<JSONObject> list = new ArrayList<>();
        //  一级，二级，三级分类数据！
        //  获取到所有的分类数据  base_category_view
        List<BaseCategoryView> baseCategoryViewList = baseCategoryViewMapper.selectList(null);
        //  分组：先按照一级分类Id 进行分组！
        //  map key = category1Id  value = List<BaseCategoryView>
        Map<Long, List<BaseCategoryView>> baseCategory1Map = baseCategoryViewList.stream().collect(Collectors.groupingBy(BaseCategoryView::getCategory1Id));

        //  声明一个index 遍历
        int index = 1;
        //  循环遍历这个map集合
        Iterator<Map.Entry<Long, List<BaseCategoryView>>> iterator = baseCategory1Map.entrySet().iterator();
        while (iterator.hasNext()){
            //  创建一个对象
            JSONObject category1 = new JSONObject();
            //  获取到 Entry 对象
            Map.Entry<Long, List<BaseCategoryView>> entry = iterator.next();
            Long category1Id = entry.getKey();
            List<BaseCategoryView> baseCategoryViewList1 = entry.getValue();
            //  一级分类Id
            category1.put("categoryId",category1Id);
            //  一级分类名称
            category1.put("categoryName",baseCategoryViewList1.get(0).getCategory1Name());
            //  表示一级分类的第几项！
            category1.put("index",index);
            //  一级分类下还有categoryChild ，必须知道二级分类数据集合！
            //  index 迭代！
            index++;
            //  获取一级分类下的二级分类数据！
            //  key = category2Id value = List<BaseCategoryView>
            Map<Long, List<BaseCategoryView>> baseCategory2Map = baseCategoryViewList1.stream().collect(Collectors.groupingBy(BaseCategoryView::getCategory2Id));
            //  循环遍历
            Iterator<Map.Entry<Long, List<BaseCategoryView>>> iterator1 = baseCategory2Map.entrySet().iterator();
            //  声明一个存储二级分类数据的集合
            List<JSONObject> category2Child = new ArrayList<>();
            while (iterator1.hasNext()){
                //  创建一个对象
                JSONObject category2 = new JSONObject();
                Map.Entry<Long, List<BaseCategoryView>> entry1 = iterator1.next();
                List<BaseCategoryView> baseCategoryViewList2 = entry1.getValue();
                Long category2Id = entry1.getKey();
                //  赋值二级分类Id
                category2.put("categoryId",category2Id);
                //  赋值二级分类name
                category2.put("categoryName",baseCategoryViewList2.get(0).getCategory2Name());
                //  存储二级分类数据
                category2Child.add(category2);

                //  创建一个集合来存储三级分类数据
                List<JSONObject> category3Child = new ArrayList<>();
                //  获取三级分类数据：
                baseCategoryViewList2.forEach(baseCategoryView -> {
                    //  创建一个对象
                    JSONObject category3 = new JSONObject();
                    category3.put("categoryId",baseCategoryView.getCategory3Id());
                    category3.put("categoryName",baseCategoryView.getCategory3Name());
                    category3Child.add(category3);
                });
                //  将三级分类数据保存到二级分类数据中
                category2.put("categoryChild",category3Child);
            }
            //  将二级分类数据保存到一级分类数据中
            category1.put("categoryChild",category2Child);
            //  将一级分类数据添加到集合中
            list.add(category1);
        }

        //  返回数据
        return list;
    }

    @Override
    public BaseTrademark getTrademarkByTmId(Long tmId) {
        return baseTrademarkMapper.selectById(tmId);
    }
}
